The compression ratio of an ideal air standard Otto cycle is 9.5. Before the isentropic compression process, the air is at 100 kPa and 35°C. The temperature at the end of isentropic
expansion is 800 K. Assume that air is an ideal gas with constant specific heats, calculate each of
the following, given that Cr=0.718 kJ/kgK, Cp=1.005 kl/kg K and gamma=1.4
1) The temperature after isentropic compression
a) 650 K b) 758 K c) 473K d) 512 K
2) The highest temperature in the cycle
a) 1969 K b) 2320 K c) 1250 K d) 941 K
3) The amount of heat added to the cycle in kJ/kg
a) 1360.5 b) 869.5 c) 1220.2 d) 678.4
4) The amount of heat rejected from the cycle in kJ/kg
a) 223.5 b) 495.7 c) 353.2 d) 687.8
5) The net work output from the cycle in kl/kg
a) 396.5 b) 516.2 c) 1135.2 d) 819.2
6) The cycle efficiency is
a) 59.4% b) 69.6% c) 36.2% d) 42.5%